ST3485E

ST3485E STMICROELECTRONICS | Alldatasheet

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Technical content

■ ESD PROTECTION: ±15KV HUMAN BODY MODEL ±8KV IEC 1000-4-2 CONTACT DISCHARGE ■ OPERATE FROM A SINGLE 3.3V SUPPLY - NO CHARGE PUMP REQUIRED ■ INTEROPERABLE WITH 5V LOGIC ■ 1µA LOW CURRENT SHUTDOWN MODE MAX ■ GUARANTEED 12 Mbps DATA RATE ■ -7 TO 12 COMMON MODE INPUT VOLTAGE RANGE ■ HALF DUPLEX VERSIONS AVAILABLE ■ INDUSTRY STANDARD 75176 PINOUT ■ CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION ■ GUARANTEED HIGH RECEIVER OUTPUT STATE FOR FLOATING INPUTS WITH NO SIGNAL PRESENT ■ ALLOW UP TO 64 TRANSCEIVERS ON THE BUS

DESCRIPTION

The ST3485E is ±15kV ESD protected, 3.3V low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST3485E transmit and receive at guaranteed data rate at least to 12Mbps. All transmitter outputs and receiver inputs are protected to ±15kV using Human Body Model. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that place the driver outputs into a high-impedance state. The ST3485E input has a true fail-safe feature that guarantees a logic high output if both inputs are open circuit, shorted together or in presence of the termination with no signal on the bus. ORDERING CODES Type Temperature Range Package Comments ST3485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST3485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST3485ECD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box ST3485EBD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST3485ECDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel ST3485EBDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel ST3485E 3.3V POWERED, 15KV ESD PROTECTED, TRASMIT AT UP TO 12MBPS TRUE RS-485/RS-422 TRANSCEIVER DIP SOP

TRUTH TABLE (DRIVER) X= Don’t Care; Z=High Impedance TRUTH TABLE (RECEIVER) X= Don’t Care; Z=High Impedance PlN N° SYMBOL NAME AND FUNCTION 1R O Receiver Output. If A>B by 200mV, RO will be high; if A<B by 200mV, RO will be low 2R E Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE is high. If RE is high and DE is low, the device will enter a low power shutdown mode. 3D E Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the part functions as line driver, while they are high impedance, it functions as line receivers if RE is low. 4D I Driver Input. A low on DI forces output A low and output B high. Similarly, a high on DI forces output A high and output B low

5 GND Ground

6 A Non-inverting Receiver Input and Non-inverting Driver Output

7 B Inverting Receiver Input and Inverting Driver Output

CC Supply Voltage: VCC = 3V to 3.6V INPUTS OUTPUTS MODE RE DE DI B A X H H L H Normal X H L H L Normal L L X Z Z Normal H L X Z Z Shutdown INPUTS OUTPUT MODE RE DE A-B RO LL ≥ -0.015V H Normal LL ≤ -0.2V L Normal L L Inputs Open H Normal L L Inputs Shorted H Normal H L X Z Shutdown

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS

ELECTRICAL CHARACTERISTICS

VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) LOGIC INPUT ELECTRICAL CHARACTERISTICS VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C) Symbol Parameter Value Unit VCC Supply Voltage 7V VI Control Input Voltage (RE,D E ) -0.3 to 7 V VDI Driver Input Voltage (DI) -0.3 to 7 V VDO Driver Output Voltage (A, B) -7.5 to 12.5 V VRI Receiver Input Voltage (A, B) -7.5 to 12.5 V VRO Receiver Output Voltage (RO) -0.3 to (V CC + 0.3) V Symbol Parameter Test Conditions Min. Typ. Max. Unit ESD ESD Protection Voltage Human Body Model ± 15 KV ESD ESD Protection Voltage IEC-1000-4-2 Contact Disharge ± 8K V Symbol Parameter Test Conditions Min. Typ. Max. Unit ISUPPLY VCC Power Supply Current No Load, DI=0V or VCC DE=V CC , RE =0V or VCC 1.3 2.2 mA DE=0V, RE =0V 1.2 1.9 mA ISHDN Shutdown Supply Current DE=0V, RE=VCC , DI=0V or VCC 0.002 1 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit VIL Input Logic Threshold Low DE, DI, RE 1.3 0.8 V VIH Input Logic Threshold High DE, DI, RE 2 V IIN1 Logic Input Current DE, DI, RE ± 2.0 µA IIN2 Input Current (A, B) DE=0V, V CC = 0 or 3.6V VIN=12V 1 mA VIN=-7V -0.8 mA

TRANSMITTER ELECTRICAL CHARACTERISTICS VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta =2 5 ° C ) RECEIVER ELECTRICAL CHARACTERISTICS VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta =2 5 ° C ) Symbol Parameter Test Conditions Min. Typ. Max. Unit VOD Differential Drive Output RL= 100Ω (RS-422) (Figure 1) 2 V R L=5 4Ω (RS-485) (Figure 1) 1.5 V R L=6 0Ω (RS-485) (Figure 2) 1.5 V ΔVOD Change in magnitude of Driver Differential Output Voltage for Complementary Output States (Note1) R L=5 4Ω or 100Ω (Figure 1) 0.2 V VOC Driver Common Mode Output Voltage R L=5 4Ω or 100Ω (Figure 1) 3 V ΔVOC Change in magnitude of Driver Common Mode Output Voltage (Note1) R L=5 4Ω or 100Ω (Figure 1) 0.2 V IOSD Driver Short Circuit Output Current ± 250 mA Symbol Parameter Test Conditions Min. Typ. Max. Unit VTH Receiver Differential Threshold Voltage VCM = -7V to 12V, DE = 0 -0.2 -0.015 V ΔV TH Receiver Input Hysteresis VCM =0 V 3 0 V VOH Receiver Output High Voltage IOUT = -4mA, VID = 200mV, (Figures 8,9) 2 V V OL Receiver Output Low Voltage IOUT = 4mA, VID = -200mV, (Figure 3) 0.4 V IOZR 3-State (High Impedance) Output Current at Receiver VCC = 3.6V V O =0 Vt oVCC ± 1 µA R RIN Receiver Input Resistance VCM = -7V to 12V 24 K Ω IOSR Receiver Short-Circuit Current VRO =0 Vt oVCC 76 0 m A

DRIVER SWITCHING CHARACTERISTICS VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta =2 5 ° C ) RECEIVER SWITCHING CHARACTERISTICS VCC =3 Vt o3 . 6 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta = 25°C) Note 1:ΔVOD and ΔVOC are the changes in VOD and VOC , respectively, when the DI input changes state. Note 2: measured on |tPLH (A)-tPHL (A)| and |tPLH (B)-tPHL (B)| Note 3: The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80ns, the part are guaren- teed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guarenteed to have entered shutdown. Symbol Parameter Test Conditions Min. Typ. Max. Unit D R Maximum Data Rate 12 15 Mbps tDD Differential Output Delay RL=6 0Ω C L = 15pF, (Figures 4,5) 18 30 ns tTD Differential Output Transition Time R L=6 0Ω C L = 15pF, (Figures 4,5) 12 20 ns tPLH tPHL Propagation Delay R L=2 7Ω C L = 15pF, (Figures 8,9) 18 30 ns tPDS |tPLH -tPHL | Propagation Delay Skew (Note2) R L=2 7Ω C L = 15pF, (Figures 8,9) 2 5 ns tPZL Output Enable Time R L=1 1 0Ω (Figures 10,11) 19 35 ns tPZH Output Enable Time R L=1 1 0Ω (Figures 6,7) 30 50 ns tPHZ Output Disable Time R L=1 1 0Ω (Figures 6,7) 19 35 ns tPLZ Output Disable Time R L=1 1 0Ω (Figures 10,11) 30 50 ns tSKEW Differential Output Delay Skew 13 n s tZH(SHDN) Driver Enable from Shutdown to Output High 30 50 ns tZL(SHDN) Driver Enable from Shutdown to Output Low 19 35 ns Symbol Parameter Test Conditions Min. Typ. Max. Unit tPLH tPHL Propagation Delay V ID =0V to 3V CL1 = 15pF, (Figures 12,13) 30 50 ns tRPDS |tPLH -tPHL | Propagation Delay Skew VID =0V to 3V CL1 = 15pF, (Figures 12,13) 1 3 ns tPZL Output Enable Time C RL = 15pF (Figures 14-18) 10 20 ns tPZH Output Enable Time C RL = 15pF (Figures 14-18) 10 20 ns tPHZ Output Disable Time C RL = 15pF (Figures 14-18) 10 20 ns tPLZ Output Disable Time C RL = 15pF (Figures 14-18) 10 20 ns tZH(SHDN) Receiver Enable from Shutdown to Output High C RL = 15pF (Figures 14-18) 10 20 ns tZL(SHDN) Receiver Enable from Shutdown to Output Low C RL = 15pF (Figures 14-18) 20 40 ns

Figure 25 :Driver Short Circuit Current

DIM. mm. inch A 3.3 0.130 a1 0.7 0.028 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 D 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L 3.3 0.130 Z 0.44 1.6 0.017 0.063 Plastic DIP-8 MECHANICAL DATA P001F

DIM. mm. inch A 1.75 0.068 a1 0.1 0.25 0.003 0.009 a2 1.65 0.064 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.019 c1 45˚ (typ.) D 4.8 5.0 0.189 0.196 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.149 0.157 L 0.4 1.27 0.015 0.050 M 0.6 0.023 S ˚ (max.) SO-8 MECHANICAL DATA 0016023

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